I’ve found that the best information about PA from a patient’s perspective comes from two online sources:
Facts and Diagnosis
PA fact sheet (PDF)
PA Symptoms – American Society of Endocrine Surgeons
PA diagnosis (PDF)
PA diagnosis – American Society of Endocrine Surgeons
Treatment of Primary Aldosteronism – this is a pretty great outline of how PA should be dealt with, step by step. Unfortunately it’s through a subscription database and most of the outbound links are not available to non-subscribers.
General endocrine disorders medical text, with a chapter on adrenal disorders including PA: